[Snyk] Security upgrade postgres from 9.5.25 to 9.6.23

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• Dockerfile

We recommend upgrading to postgres:9.6.23, as this image has only 112 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	364	Use of a Broken or Risky Cryptographic Algorithm SNYK-DEBIAN9-LIBGCRYPT20-1582895	No Known Exploit
	364	Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') SNYK-DEBIAN9-LIBXML2-1293203	No Known Exploit
	364	Out-of-bounds Read SNYK-DEBIAN9-OPENSSL-1569399	No Known Exploit
	221	CVE-2021-3997 SNYK-DEBIAN9-SYSTEMD-2332028	No Known Exploit
	364	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN9-TAR-312293	No Known Exploit

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